20772046157 has 2 divisors, whose sum is σ = 20772046158. Its totient is φ = 20772046156.

The previous prime is 20772046129. The next prime is 20772046171. The reversal of 20772046157 is 75164027702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20286020041 + 486026116 = 142429^2 + 22046^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20772046157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20772045157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10386023078 + 10386023079.

It is an arithmetic number, because the mean of its divisors is an integer number (10386023079).

Almost surely, 2^20772046157 is an apocalyptic number.

It is an amenable number.

20772046157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20772046157 is an equidigital number, since it uses as much as digits as its factorization.

20772046157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 164640, while the sum is 41.

The spelling of 20772046157 in words is "twenty billion, seven hundred seventy-two million, forty-six thousand, one hundred fifty-seven".